As least with Fusion you don't get the horrendous bouncing upon landing off a steep drop. And the ships turn from the rear. And there's neGcon compatibility with the NTSC version. And Piranha is nimble instead of tank-like.
I'm content to say Pure is further detached from the PS1 trilogy than Fusion is. Still a great game though, but nothing near as close to WO3 as anyone thinks.
+1 for Maxmillian. WE NEED MORE OF THAT RED GRAPH!